diff --git a/Gemfile.lock b/Gemfile.lock
index 8fc0de8..225017b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -89,7 +89,7 @@ GEM
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    json (2.1.0)
+    json (2.3.1)
     less (2.6.0)
       commonjs (~> 0.2.7)
     less-rails (2.8.0)